| 发明名称 |
FRONT END CIRCUIT |
| 摘要 |
A front end circuit includes a transmission signal filter for allowing a transmission signal to pass, a reception signal filter for allowing a reception signal to pass and a circulator (an antenna duplexer), and a transmission output variable circuit is connected between a transmission signal terminal of the circulator and the transmission signal filter. The transmission output variable circuit includes a first high frequency switch, a second high frequency switch, and a buffer circuit, and attenuation is switched by switching of the first high frequency switch and the second high frequency switch. |
| 申请公布号 |
US2015188601(A1) |
申请公布日期 |
2015.07.02 |
| 申请号 |
US201414576416 |
申请日期 |
2014.12.19 |
| 申请人 |
Murata Manufacturing Co., Ltd. |
发明人 |
Onaka Kengo;Tanaka Hiroya;Obiya Hidenori |
| 分类号 |
H04B1/48 |
主分类号 |
H04B1/48 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A front end circuit comprising: a transmission signal filter for allowing a transmission signal to pass; a reception signal filter for allowing a reception signal to pass; an antenna duplexer; an antenna port into/from which antenna transmission/reception signals are input/output; a reception port from which the reception signal is output; a transmission port into which the transmission signal is input; and
a transmission output variable circuit connected between a transmission signal terminal of the antenna duplexer and the transmission port and limiting strength of the transmission signal according to a control signal. |
| 地址 |
Kyoto JP |
